Protein Tyrosine Phosphatase Assays

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Abstract

Tyrosine phosphorylation and dephosphorylation of proteins play a critical role in many processes of the immune system, from early development to fully differentiated effector function. Since the opposing actions of protein tyrosine kinases (PTKs) and protein tyrosine phosphatases (PTPs) determine the steady-state level of tyrosine phosphorylation on a given protein, it is often important for mechanistic studies to determine the specific activities of PTKs and PTPs. PTPs are defined by their enzymatic activity that catalyzes the dephosphorylation of phosphotyrosine residues. This unit focuses on methods to determine the enzymatic activity of PTPs.While there are many varieties of PTP assays, the focus in this unit is on immune complex PTP assays, which do not require elaborate biochemical purifications and are commonly used to test the activities of specific PTPs in the immune system.

Original languageEnglish
Article number11.7
JournalCurrent Protocols in Essential Laboratory Techniques
Volume2011
Issue numberSUPPL.93
DOIs
StatePublished - Apr 2011

Keywords

  • Immunoprecipitation
  • Malachite green assay
  • Phosphopeptide
  • Phosphoprotein
  • Phosphoproteins
  • Protein tyrosine phosphatase
  • Protein tyrosine phosphatase assay
  • Radioactively labeled
  • pNPP

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